https://www.gamespot.com/articles/fortnite-season-3-about-to-end-last-chance-for-cha/1100-6458600/

Fortnite: Battle Royale Season 3 is coming to an end. Epic Games announced Season 4 will start Tuesday, May 1, and that means today, April 30, is Battle Pass owners' last chance to complete Season 3 challenges and reap the rewards.

Season 3 was made up of 10 weeks of challenges, ranging from blowing up opponents to finding llamas and hidden gnomes. While new challenges were revealed every seven days, you can still go back and complete previous weeks' challenges, meaning there are tons of opportunities and rewards available right now that will disappear tomorrow. In order to play, you need a Battle Pass, which can be bought in-game for 950 V-Bucks.